UNI-T UT804
 | |
| Status | in progress |
|---|---|
| Source code | serial-dmm |
| Counts | 40000/4000 |
| IEC 61010-1 | CAT III (1000V) / CAT IV (600V) |
| Connectivity | RS232 and USB (see also RS232 / USB) |
| Measurements | voltage, resistance, diode, continuity, capacitance, frequency, duty cycle, current, temperature |
| Features | autorange, hold, relative, min/max, bargraph, backlight, true-rms, data storage |
| Website | uni-trend.com |
The UNI-T UT804 is a 40000/4000 counts, CAT III (1000V) / CAT IV (600V) handheld digital multimeter with RS232 and USB connectivity.
See UNI-T UT71x series for information common to all devices in this series.
Hardware
Multimeter:
- 44000/440000-count dual-slope ADC: Cyrustek ES51966P (datasheet)
- 16-bit microcontroller: MSP430F149 datasheet
RS232 cable:
USB cable:
Disassembly
There are four screws on the bottom, one of them is captive and does not come out. The red (or grey in the newer revisions) plastic is held on two points top and bottom each. It can be taken off with the help of a flathead screwdriver and pops off easily.
The rubber part taken off
Usage
To receive data from the UT804 via USB the driver and the USB VID/PID of the WCH CH9325 needs to be specified like this:
sigrok-cli -d uni-t-ut804:conn=1a86.e008 --continuous
Photos
PCB, front
DMM, inside
Fuse holder
USB and RS232 PCB, top
USB and RS232 PCB, bottom
RS232 interface:
USB interface:
Protocol
See UNI-T UT71x series#Protocol.